<template>
  <div class="goodsinfo-container">
    <!--给小球添加动画-->
    <transition 
    @before-enter="beforeEnter" 
    @enter="enter" 
    @after-enter="afterEnter">
      <div class="ball" v-show="ballFlag" ref="ball"></div>
    </transition>

    <!--商品轮播图区域-->
    <div class="mui-card">
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <swiper :lunbotulist="lunbotu"></swiper>
        </div>
      </div>

      <!--商品购买区域-->
      <div class="mui-card">
        <div class="mui-card-header">{{goodsinfo.title}}</div>
        <div class="mui-card-content">
          <div class="mui-card-content-inner">
            <p class="price">
              市场价：￥
              <del>{{goodsinfo.market_price}}</del>&nbsp;&nbsp;销售价：
              <span class="now_price">￥{{goodsinfo.sell_price}}</span>
            </p>
            <p>
              购买数量：
              <!--把父组件的方法传递给子组件-->
              <numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox>
            </p>
            <p>
              <mt-button type="primary" size="small">立即购买</mt-button>
              <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
            </p>
          </div>
        </div>
      </div>
      <!--商品参数区域-->
      <div class="mui-card">
        <div class="mui-card-header">商品参数</div>
        <div class="mui-card-content">
          <div class="mui-card-content-inner">
            <p>商品货号：{{goodsinfo.goods_no}}</p>
            <p>库存情况：{{goodsinfo.stock_quantity}}</p>
            <p>上架时间：{{goodsinfo.add_time|fmtDate}}</p>
          </div>
        </div>
        <div class="mui-card-footer">
          <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
          <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import swiper from "../subcomponents/swiper.vue";
import numbox from "../subcomponents/goodsinfo_numbox.vue";
export default {
  data() {
    return {
      id: this.$route.params.id,
      lunbotu: [], //存放轮播图
      goodsinfo: {}, //存放商品详情
      ballFlag: false, //控制小球隐藏和显示的标识符
      selectdCount: 1 //设置用户选中的数量，默认选中一个
    };
  },
  created() {
    this.getLunbo();
    this.getGoodsInfo();
  },
  methods: {
    getLunbo() {
      this.$http.get("api/getthumimages/" + this.id).then(result => {
        if (result.body.status === 0) {
          result.body.message.forEach(item => {
            item.img = item.src;
          });
          this.lunbotu = result.body.message;
        }
      });
    },
    getGoodsInfo() {
      this.$http.get("api/goods/getinfo/" + this.id).then(result => {
        if (result.body.status === 0) {
          this.goodsinfo = result.body.message[0];
        }
      });
    },
    goDesc(id) {
      //点击使用编程式导航，跳转图文介绍页面
      this.$router.push({ name: "goodsdesc", params: { id } });
    },
    goComment(id) {
      //点击跳转评论页面
      this.$router.push({ name: "goodscomment", params: { id } });
    },
    beforeEnter(el) {
      el.style.transform = "translate(0,0)";
    },
    enter(el, done) {
      //获取小球在页面中的位置
      const ballPosition = this.$refs.ball.getBoundingClientRect();
      const badgePosition = document.getElementById("badge").getBoundingClientRect();

      const xDist = badgePosition.left - ballPosition.left;
      const yDist = badgePosition.top - ballPosition.top;
      //产生动画效果
      el.offsetWidth;
      el.style.transform = `translate(${xDist}px,${yDist}px)`;
      //跳动的效果cubic-bezier(.4,-0.3,1,.68)
      el.style.transition = "all 0.5s cubic-bezier(.4,-0.3,1,.68)";
      console.log("enter" + this.ballFlag);
      done();
    },
    afterEnter(el) {
      this.ballFlag = !this.ballFlag;
    },
    addToShopCar() {
      //添加到购物车
      this.ballFlag = !this.ballFlag;

      // {id：商品的id,count:商品的数量,price:商品的价格,selected:商品是否被选中}
      //拼接出一个要保存到store中car 里的商品信息对象
      var goodsinfo = {
        id: this.id,
        count: this.selectdCount,
        price: this.goodsinfo.sell_price,
        selected: true
      };
      //调用store中的mutations来将商品添加到购物车
      this.$store.commit("addToCar", goodsinfo);
    },

    getSelectedCount(count) {
      //当子组件把选中的数量传给父组件时，把选中的值保存到data上
      this.selectdCount = count;
    }
  },
  components: {
    swiper,
    numbox
  }
};
</script>

<style scoped>
.now_price {
  color: red;
  font-size: 16px;
  font-weight: bold;
}
.mui-card-footer {
  display: block;
}
.mint-button {
  margin: 10px 0;
}
.ball {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: red;
  position: absolute;
  z-index: 99;
  top: 407px;
  left: 161px;
}
.goodsinfo-container {
  background-color: #cccccc;
  overflow: hidden;
}
</style>